Compound type wind, rain and vibration resistance stay cable

Abstract

The invention relates to a compound type wind, rain and vibration resistance stay cable. The stay cable is formed by embossing on the surface of a protection sleeve of a stay cable (1), and winding spiral bars (2). On the one hand, the stay cable utilizes the embossing type to change the positions of flow separation points of air flow around the original cross section, disturb the air flow around the cross section of the stay cable, reduce the vortex induced vibration, inhibit the formation of an upward water way and the axial flow, better inhibit wake flow galloping and rain-wind-induced vibration, and simultaneously ensure a smaller wind drag coefficient and reduce the wind load of bridge cables; on the other hand, the stay cable utilizes double spiral bars to forcibly guide rainwater to avoid the formation of the upward water way, and simultaneously disturb the flowing type of the cross flow, the stay cable reduces the correlation of vortex shedding, further avoids the generation of big and regular swirls and reduces the aerodynamic force of the exciting vibration. By jointly using the embossing type and the spiral bars, the vibration of inhaul cables of the cable-stayed bridge is effectively inhibited.

Description

(1) Technical field [0001] The invention relates to a cable-stayed cable, in particular to a cable-stayed cable for resisting wind and rain vibration of a cable-stayed bridge. (2) Background technology [0002] Wind and rain induced vibration is a kind of intense and large-scale vibration of the cables of cable-stayed bridges under the joint action of wind and rain. Among the many wind-induced vibrations of the cables, the wind-wind-induced vibration is the most intense and causes the greatest harm. The formation of the waterway on the surface of the cable and the interaction of the airflow around the cable are the main reasons for the wind and rain-induced vibration of the cable. At present, there are mainly two kinds of vibration reduction measures for cables: mechanical measures and pneumatic measures. [0003] Mechanical measures include installing auxiliary cables in the cable plane and installing dampers at both ends of the cables. However, the amount of auxiliary c...

AI Technical Summary

Problems solved by technology

Although setting the groove can play a role in destroying the waterline, the section with the groove itself will cause galloping instability. Therefore, at present, the surface embossing and the winding of the spiral rib are mainly used.

[0005] Surface embossing and winding spiral ribs can effectively weaken the formation of water channels on the surface of the cable, and better suppress wind and rain-induced vibration. However, in some cases, the surface embossed form of the cable still inevitably occurs wind and rain-induced vibration. had a bad effect

However, the simple winding spiral tendon cables usually have a large drag coefficient, which has the disadvantage of increasing the wind load of the bridge cables.

Images